2288thánatos (derived from 2348/thnḗskō, "to die") – physical or spiritual death; (figuratively) separation from the life (salvation) of God forever by dying without first experiencing death to self to receive His gift of salvation.

2. metaphorically, the loss of that life which alone is worthy of the name, i. e. "the misery of soul arising from sin, which begins on earth but lasts and increases after the death of the body": 2 Corinthians 3:7; James 1:15 (Clement of Rome, 2 Cor. 1, 6 [ET] says of life before conversion to Christ, ὁβίοςἡμῶνὅλοςἄλλοοὐδένἦνεἰμήθάνατος (cf. Philo, praem. et poenis § 12, and references in 4 below)); opposed to ἡζωή, Romans 7:10, 13; 2 Corinthians 2:16; opposed to σωτηρία, 2 Corinthians 7:10; equivalent to the cause of death, Romans 7:13; σῴζεινψυχήνἐκθανάτου, James 5:20; μεταβεβηκέναιἐκτοῦθανάτουεἰςτήνζωήν, John 5:24; 1 John 3:14; μένεινἐντῷθανάτῳ, 1 John 3:14; θεωρεῖνθάνατον, John 8:51; γεύεσθαιθανάτου, John 8:52 (see 1 above); ἁμαρτία and ἁμαρτάνεινπρόςθάνατον (see ἁμαρτία, 2 b.), 1 John 5:16f (in the rabbinical writers לָמוּתחֵטְא — after Numbers 18:22, the Sept.ἁμαρτίαθανατηφόρος — is acrimen capitale).

3.the miserable state of the wicked dead in hell is called — now simply θάνατος, Romans 1:32 (Wis. 1:12f Wis. 2:24; Tatian or. ad Graec. c. 13; the author of the epistle ad Diognet. c. 10, 7 [ET] distinguishes between ὁδοκῶνἐνθάδεθάνατος, the death of the body, and ὁὄντωςθάνατος, ὅςφυλάσσεταιτοῖςκατακριθησομενοιςεἰςτόπῦρτόαἰώνιον); now ὁδεύτεροςθάνατος and ὁθάνατοςὁδεύτερος (as opposed to the former death, i. e. to that by which life on earth is ended), Revelation 2:11; Revelation 20:6, 14b; Revelation 21:8 (as in the Targums on Deuteronomy 33:6; Psalm 48:11 (); Isaiah 22:14; Isaiah 66:15; (for the Greek use of the phrase cf. Plutarch, de fade in orbe lunae 27, 6, p. 942 f.); θάνατοςαἰώνιος, the Epistle of Barnabas 20, 1 [ET] and in ecclesiastical writings (ὁἀΐδιοςθάνατος, Philo, post. Cain. § 11 at the end; see also Wetstein on Revelation 2:11)).

4. In the widest sense, death comprises all the miseries arising from sin, as well physical death as the loss of a life consecrated to God and blessed in him on earth (Philo, alleg. legg. i. § 33 ὁψυχῆςθάνατοςἀρετῆςμένφθοράἐστι, κακίαςδέἀνάληψις (de profug. § 21 θάνατοςψυχῆςὁμετάκακίαςἐστιβίος, especially §§ 10, 11; qued det. pot. insid. §§ 14, 15; de poster. Cain. § 21, and de praem. et poen. as in 2 above)), to be followed by wretchedness in the lower world (opposed to ζωήαἰώνιος): θάνατος seems to be so used in Romans 5:12; Romans 6:16, 21 (Romans 6:23; yet others refer these last three examples to 3 above); Romans 7:24; Romans 8:2, 6; death, in this sense, is personified in Romans 5:14, 17, 21; Romans 7:5. Others, in all these passages as well as those cited under 2, understand physical death; but see Philippi on Romans 5:12; Messner, Lehre der Apostel, p. 210ff

Strong's Exhaustive Concordance

deadly, death.

From thnesko; (properly, an adjective used as a noun) death (literally or figuratively) -- X deadly, (be...) Death.